Abstract:
Utilizing turbidimetry data, an examination is conducted on the behavior of solutions containing N-vinylpyrrolidone and vinyl propyl ether copolymer within a temperature range coinciding
with the occurrence of a phase transition. The investigation reveals that within specific conditions
prevailing in this domain, the emergence of entities denoted as hydrophobic–hydrophilic associates
is conceivable. These entities are characterized by the presence of a relatively dense core, upheld by
hydrophobic interplays, and they are proficient in effectively dispersing irradiation within the optical
spectrum. Encircling this core is a hydrophilic periphery that impedes the formation of insoluble
precipitates. The development of such associates transpires when hydrophobic interactions have
attained a discernible prominence, although they remain inadequate to counteract the forces that
drive the expansion of macromolecular coils. Under these circumstances, the energetically favored
course of action entails the constitution of a core for the aforementioned associates, involving discrete segments from diverse macromolecules. Notably, the introduction of an additional constituent
(ethanol) to the solution, which selectively mitigates hydrophobic interactions, serves to stabilize the
hydrophobic–hydrophilic associations.
